SWDM240B OPERATION & MAINTENANCE MANUAL
If oil is dirty, the hydraulic components will be abraded quicker, resulting in
the valve spool stuck and clogged resistance hole.
The cleanness of hydraulic oil should be under level NAS9.
Following points should be observed to keep the hydraulic system oil clean.
Clean hydraulic oil tank before filling oil.
Clean the surrounding of oil filler and fill oil with fine filter. Install the oil cap
at time and keep the oil tank is sealed.
After initial 500 hours of operation, clean or change filter element and filter
hydraulic oil. After that clean or change filter element and hydraulic oil every
500 to 1000 hours of operation. If the drilling machine has been stored for over
than one year, the hydraulic oil should be changed or filtered.
If the drilling machine is stopped for a long time, air with water will enter into
the oil tank via air filter, and bring water into hydraulic oil, emulsifying oil and
denaturing it, thus, it will take a while to heat up oil eliminating water and then
operate the machine.
7.10.9 Hydraulic Oil Temperature Control
Hydraulic oil should be not over than 80
℃
normally, no more than 90
℃
at most during
operation.
If oil is too hot, the service life of hydraulic components will be shortened by
more abrasion, increasing inner leakage caused by less oil viscosity and worse
lubrication. Besides, the aging of seal parts will be accelerated and oil quality
will be easier to go bad.
If oil is too low, oil viscosity will be increased, the loss of pressure will be
more, and oil will flow slowly affecting the flow of resistance hole and
extending the time of motion, thus, the machine will be sluggish, even will not
able to work.
When oil temperature is over then 80℃, stop operation to idle the machine
cooling down. When starting the machine at -20
℃
, power on and idle the
rotary head for a while, then operate it after the oil is heated up.
Note for Hydraulic System Maintenance：
Pressure and flow parameter of hydraulic components have been set before
machine delivered from the factory, forbid to change that. If adjustment is
necessary, professional personnel are needed for that.
After initial start-up or disassembly for repair, air will exist in the hydraulic
pipeline, power on the machine to idle and make cylinders to move within the
maximum stroke repeatedly to exhaust air, and loosen pipe joint if necessary.
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